8 results about "Slip frequency" patented technology

The application discloses a slip power control method of a linear motor, a maglev train, equipment and a medium, and relates to the technical field of linear motor control. The method comprises the following steps: controlling a first double-fed linear motor and a second double-fed linear motor to generate different primary power supply frequencies, and then obtaining different slip frequencies; under the premise of controlling the first double-fed linear motor and the second double-fed linear motor to generate a required composite driving force, respectively controlling a pair of balance forces with equal size and opposite directions to be superposed on the secondaries of the first double-fed linear motor and the second double-fed linear motor; and according to the slip frequencies, adjusting the size of the balance forces to adjust the slip power of the first double-fed linear motor and the second double-fed linear motor. The application can effectively control the slip power when the reaction force of the double-fed linear motor is insufficient.

The disclosure of this method is intended for the predictive maintenance market, presenting an innovative method for detecting faults in hydraulic couplings, crucial components in power transmission systems across various industrial sectors. Slippage in hydraulic couplings, which is a loss of efficiency in torque transmission, can indicate wear, insufficient / excessive lubricant, or other problems, resulting in unplanned downtime and maintenance costs. The method uses metrics extracted from vibration signals to identify slippage, such as SFI (Slipping Frequency Indicator) and SNR (Signal-to-Noise Ratio). The combination of these metrics and other signal processing allows for accurate and reliable slippage detection, preventing catastrophic failures in industrial systems.

The application discloses an alternating current excitation system self-starting control method and system, and the method comprises the following steps: acquiring a rotor current rotating frequency and an actual rotor rotating frequency, and generating a slip frequency; comparing the slip frequency with a preset dynamic threshold value, and dynamically adjusting a rotating speed given value; inquiring a preset multi-stage segmented current control curve according to the actual rotor rotating frequency, and outputting a d-axis current given value; generating a q-axis current given value based on PI adjustment of the slip frequency, and applying a corresponding preset current threshold value limit according to a frequency band where the actual rotor rotating frequency is located; adopting a non-coupling parameter setting algorithm to independently configure parameters of a magnetic flux current control loop and a torque current control loop; and generating an optimal starting parameter combination under the condition of meeting a stable starting constraint condition in a unit starting process. The application realizes stable self-starting of the alternating current excitation system by dynamically adjusting the rotating speed given value and segmentally controlling the current, and improves the reliability and efficiency of the starting process.

The invention discloses an anti-slip control method and system for hot continuous rolling production of an ultrathin aluminum plate base. The anti-slip control method comprises the following steps that S1, roller surface modification is conducted, specifically, a CrAlN / TiN gradient composite coating is prepared through a physical vapor deposition technology; s2, a lubricating medium is configured and supplied, specifically, the oil film thickness and flow of the finish rolling section are precisely controlled through an intelligent lubricating system; s3, setting a rolling process procedure: designing and executing a reduction rate gradient distribution strategy from rough rolling to finish rolling based on the characteristics of a hot continuous rolling unit; and S4, dynamic monitoring and adjustment are conducted, specifically, when it is detected that the rolling force fluctuation exceeds a preset threshold value, the reduction rate and the rolling speed of the target rack are automatically and finely adjusted through a rolling force-speed linkage control model. According to the collaborative anti-slip control method and system, the special roller surface, the stable lubrication interface, the matching reduction schedule and the dynamic response mechanism are integrated, the slip frequency is fundamentally reduced, strip surface scratches and roller aluminum sticking are reduced, and the product surface quality and the yield are improved.

The invention relates to the technical field of petroleum engineering equipment control, in particular to a fluid adding method based on coupling feedback of a rotor pump and a mass flow meter. The rotating speed of the rotor pump is adjusted based on the slip frequency, and the flow speed and additive amount of the high-viscosity fluid are adjusted; and a slip calculation model is provided. According to the method, the slip frequency model based on the in-pump leakage mechanism is introduced for the first time, the slip frequency amount which is generated by the high-viscosity fluid in the pump and changes along with time can be recognized in real time, the problem that the slip frequency is uncontrollable due to high viscosity is solved, and the flow precision is remarkably improved.

To provide a power conversion device and a motor control system capable of implementing stable speed control even if a speed response is enhanced. Therefore, there are provided a power converter 2 that converts DC power into AC power and outputs the AC power to an induction motor based on AC voltage command values vu*, vv*, and vw* in stationary coordinates, and a controller CT that calculates the voltage command values in the stationary coordinates by vector control. The controller CT adds, to a steady-state value of a slip frequency determined by a d-axis current (id), a q-axis current (iq), and a secondary time constant (T2), a transient value determined by differential calculation using the d-axis current (id) and the q-axis current (iq) to calculate a slip frequency command value ωs**.

An arrangement for determining the operational performance of a rotating electric machine connected to an operating voltage includes a sensor apparatus and a computing device. The sensor apparatus is designed to capture a stray magnetic field outside the machine and to calculate from the captured stray magnetic field a slip frequency and a synchronous frequency. An enhanced equivalent circuit diagram including predetermined, machine-specific parameters is stored on the computing device. The computing device is configured to determine, on the basis of the calculated slip frequency and synchronous frequency, a slip and then to determine the operational performance of the machine by the enhanced equivalent circuit diagram.

The invention relates to a motor belt slipping detection method and system, and relates to the technical field of motor belt abnormity detection, the method comprises the following steps: receiving a vibration frequency transmitted by a belt, the receiving equipment being an acceleration sensor; performing signal preprocessing based on the vibration frequency to obtain a processed vibration frequency; performing FFT processing based on the processing vibration frequency to obtain a frequency spectrum feature map; and when the preset slipping frequency spectrum feature exists in the frequency spectrum feature map, outputting a preset belt slipping result. The method has the advantages that through vibration spectrum analysis and transmission ratio checking, belt slipping is verified in a two-way cross mode, dependence on multiple components is reduced, the detection reliability is improved, and the system cost is reduced.